Coffee with mushrooms? Doesn't sound like a good idea, although I would like to try it and see what it's like. Of course, not everyone has the same tastes, maybe for many people it sucks and for others it's the best thing they've ever tasted. Anyway, as an influencer you will always have haters no matter what you do.
I would take the risk, but I would make it clear that I will only tell the truth and only the truth, I will not cheat my followers for a wad of cash, if I think it's good or bad, I will say so.